Instructions

U.are.U SDK - Developer Guide 81
Glossary
General Terms
Fingerprint
The impression left from the friction ridges of a human finger.
Fingerprint characteristics
The biological finger surface details that can be detected and from which distinguishing and repeatable fingerprint
features can be extracted.
Fingerprint minutiae
The fingerprint characteristics commonly used in fingerprint recognition systems. Fingerprint minutiae include:
Ridge ending – the abrupt end of a ridge
Ridge bifurcation – a single ridge that divides into two ridges
Short ridge, or independent ridge – a ridge that commences, travels a short distance and then ends
Island – a single small ridge inside a short ridge or ridge ending that is not connected to all other ridges
Ridge enclosure – a single ridge that bifurcates and reunites shortly afterward to continue as a single ridge
Spur – a bifurcation with a short ridge branching off a longer ridge
Crossover or bridge – a short ridge that runs between two parallel ridges
Delta – a Y-shaped ridge meeting
Core – a U-turn in the ridge pattern.
Fingerprint Data
Fingerprint sample
An analog or digital representation of a fingerprint obtained from a fingerprint capture device. See also fingerprint
image.
Fingerprint image
A digital representation of a fingerprint sample encoded as a spatially mapped array of pixels. A fingerprint image is
the only representation of a fingerprint sample supported by Crossmatch products, thus the terms fingerprint image and
fingerprint sample are used interchangeably.
Fingerprint features
The digital representation of fingerprint characteristics.
Fingerprint Image Data (FID)
The binary data containing one or more fingerprint images from one or multiple fingers of the same person.
Fingerprint Image View (FIV)
The part of an FID that contains a fingerprint image from a single impression of a single finger.
In the majority of cases, an FID contains only one FIV.
Fingerprint Minutiae Data (FMD)
The digital representation of fingerprint minutiae, and optionally other fingerprint characteristics, from one or
multiple fingers of the same person.